Fix URL so output of mim list looks better

[1qh]

now when I mim list, It looks like this:

Package         Version    Source
--------------  ---------  -------------------------------------------
mmaction2       1.0.0      https://github.com/open-mmlab/mmaction2
mmcv            2.0.0      https://github.com/open-mmlab/mmcv
mmdet           3.0.0      https://github.com/open-mmlab/mmdetection
mmengine        0.7.2      https://github.com/open-mmlab/mmengine
mmpose          1.0.0      https://github.com/open-mmlab/mmpose
mmsegmentation  1.0.0      http://github.com/open-mmlab/mmsegmentation

I fix this to make it look better.

Thank you a lot!

[CLAassistant]

All committers have signed the CLA.

[1qh]

LGTM

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.08 ⚠️

Comparison is base (892f9e1) 83.66% compared to head (7b69a45) 83.59%.

❗ Current head 7b69a45 differs from pull request most recent head fe2b10f. Consider uploading reports for the commit fe2b10f to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2902      +/-   ##
===========================================
- Coverage    83.66%   83.59%   -0.08%     
===========================================
  Files          156      156              
  Lines         9355     9355              
  Branches      1373     1373              
===========================================
- Hits          7827     7820       -7     
- Misses        1283     1293      +10     
+ Partials       245      242       -3     

Flag	Coverage Δ
unittests	83.59% <ø> (-0.08%)	⬇️

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see 1 file with indirect coverage changes

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